The consumption of sheep lung, a key ingredient of haggis, has been illegal inthe States since 1971, while all British lamb has been banned there since the 1989 foot-and-mouth crisis.

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Environment Secretary Owen Paterson, who earlier this year successfully lobbied to allow UK beef exports back into the US, has urged his opposite number Tom Vilsack to end the ban.

Paterson, who believes the market could be worth millions, said: “I share haggis producers’ disappointment that American diners are unable to enjoy the taste of Scotland’s wonderful national dish in their own country.”